Numerical analysis of performance of water‐based nanofluid flowing through tube bent at 90°

Abstract

The aim of the present study is to analyze the performance of CuO nanofluids with water as the base fluid in the flat tube bent at 90°. The analytical analysis has been performed under different Reynolds number as well as nanoparticle volume concentrations. Various thermophysical properties, that is, density, thermal conductivity, viscosity, and specific heat capacity have been estimated with well-developed models of each, presented during previous studies carried out in the field of nanofluids. The simulation work has been performed with the help of the finite volume method. It was concluded from this study that heat transfer coefficient and Nusselt number of nanofluids at different volume concentrations between 0.1% to 0.5% v/v CuO is higher than that of the base fluids. The pressure drop obtained upon the use of nanofluids is found to be higher than the base fluid. The study also proves that nanofluids have a huge potential in playing an important role in decreasing sizes of heat transfer systems.

Effect of metal oxide nanofluids on the performance of passive solar still single slope for two different absorbent plates

“…The specific heat of nanofluids ($$C{p}_{nf}$$) 31 : $$${(\rho Cp)}_{nf}=(1-{\varphi }_{v}){(\rho Cp)}_{bf}+{\varphi }_{v}\times {(\rho Cp)}_{p}$$$…”

“…The addition of nanoparticles profoundly modifies the thermophysical properties such as thermal conductivity, dynamic viscosity, specific heat, density, and thermal expansion of solutions. Assuming that the nanoparticles are well dispersed in the base fluid and that they are in a state of thermal equilibrium, and using the most commonly used mixing laws, will calculate the effective thermophysical properties of the nanofluid for a volume concentration from the following equations: The density of nanofluids ($${\rho }_{nf}$$) 31 : $$${\rho }_{nf}=(1-{\varphi }_{v}){\rho }_{bf}+{\varphi }_{v}\times {\rho }_{p}$$$ The specific heat of nanofluids ($$C{p}_{nf}$$) 31 : $$${(\rho Cp)}_{nf}=(1-{\varphi }_{v}){(\rho Cp)}_{bf}+{\varphi }_{v}\times {(\rho Cp)}_{p}$$$ The viscosity of nanofluids ($${\mu }_{nf}$$) 31 : $$${\mu }_{nf}={\mu }_{bf}(1+2.5{\varphi }_{v})$$$ The effective thermal conductivity of nanofluids ($${K}_{nf}$$)…”

“…The viscosity of nanofluids ($${\mu }_{nf}$$) 31 : $$${\mu }_{nf}={\mu }_{bf}(1+2.5{\varphi }_{v})$$$…”

Theoretical study of non-Newtonian micropolar nanofluid flow over an exponentially stretching surface with free stream velocity

“…Numerical outcomes of nanofluid effects discussed by Kumar and Sokhal. 22 Khan et al 23 studied the features of activation energy and Wu's slip of bioconvection with magnetized couple stress nanofluid. Nadeem et al 24 examined the impacts of CNTs with base fluid at rotating disk.…”

Numerical Simulation of the Performance of Applying Different Nanofluids in a Tube with a 90° Bend at the Center of the Tube

“…In a study, Kumar et al [51] carried out a numerical analysis for the tube bend with CuO nanofluids at low Reynolds number while this study has been proceeded with three different nanofluids and at high Reynolds number at which most of flat tube applications are used. The nanofluids selected for this study are alumina, CuO, and carbon nanotubes.…”